Ron,
That rig is looking good. When I first looked at it I thought you were using a form of the tension springs like on garage doors, the ones that when someone that doesn't know what they are doing tries to work on them, end up calling a pro and 9-1-1. ;-) Looking at it now I think the springs you are using are the flat straps looking ones running between the upper and lower bars or am I still confused? (That happens a lot) Where did you find the springs that you are using?
Tom